Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Beans45601-at-aol-dot-com> I am in the process of building my new coil, but wondering if I should use 1/4, 1/2, or 3/4 inch copper tubing for my primary. My power supply will be 2 12/60 nst's (1440W). Also, what size tubing should I use for my spark rail? Thanks Adam